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package javax.swing.plaf.synth;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.DefaultListCellRenderer;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.UIResource;
import javax.swing.plaf.basic.BasicListUI;

Provides the Synth L&F UI delegate for JList. 
Author:
Scott Violet
Since:
1.7/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JList}.
 *
 * @author Scott Violet
 * @since 1.7
 */
public class SynthListUI extends BasicListUI
                         implements PropertyChangeListener, SynthUI {
    private SynthStyle style;
    private boolean useListColors;
    private boolean useUIBorder;

    
Constructs a SynthListUI. /**
     *
     * Constructs a {@code SynthListUI}.
     */
    public SynthListUI() {}

    
Creates a new UI object for the given component.
Params:
list – component to create UI object for
Returns:
the UI object/**
     * Creates a new UI object for the given component.
     *
     * @param list component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent list) {
        return new SynthListUI();
    }

    
Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the BasicListUI.paint method. 
In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method. 
Params:
g – the Graphics object used for painting
c – the component being painted
See Also:
BasicListUI.paint/**
     * Notifies this UI delegate to repaint the specified component.
     * This method paints the component background, then calls
     * the {@link #paint} method.
     *
     * <p>In general, this method does not need to be overridden by subclasses.
     * All Look and Feel rendering code should reside in the {@code paint} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint
     */
    @Override
    public void update(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);
        context.getPainter().paintListBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight());
        paint(g, c);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintListBorder(context, g, x, y, w, h);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installListeners() {
        super.installListeners();
        list.addPropertyChangeListener(this);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e)) {
            updateStyle((JList)e.getSource());
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners() {
        super.uninstallListeners();
        list.removePropertyChangeListener(this);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installDefaults() {
        if (list.getCellRenderer() == null ||
                 (list.getCellRenderer() instanceof UIResource)) {
            list.setCellRenderer(new SynthListCellRenderer());
        }
        updateStyle(list);
    }

    private void updateStyle(JComponent c) {
        SynthContext context = getContext(list, ENABLED);
        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {
            context.setComponentState(SELECTED);
            Color sbg = list.getSelectionBackground();
            if (sbg == null || sbg instanceof UIResource) {
                list.setSelectionBackground(style.getColor(
                                 context, ColorType.TEXT_BACKGROUND));
            }

            Color sfg = list.getSelectionForeground();
            if (sfg == null || sfg instanceof UIResource) {
                list.setSelectionForeground(style.getColor(
                                 context, ColorType.TEXT_FOREGROUND));
            }

            useListColors = style.getBoolean(context,
                                  "List.rendererUseListColors", true);
            useUIBorder = style.getBoolean(context,
                                  "List.rendererUseUIBorder", true);

            int height = style.getInt(context, "List.cellHeight", -1);
            if (height != -1) {
                list.setFixedCellHeight(height);
            }
            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults() {
        super.uninstallDefaults();

        SynthContext context = getContext(list, ENABLED);

        style.uninstallDefaults(context);
        style = null;
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, getComponentState(c));
    }

    private SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(c, style, state);
    }

    private int getComponentState(JComponent c) {
        return SynthLookAndFeel.getComponentState(c);
    }

    
The DefaultListCellRenderer installed by the UI. /**
     * The {@code DefaultListCellRenderer} installed by the UI.
     */
    @SuppressWarnings("serial") // Superclass is not serializable across versions
    private class SynthListCellRenderer extends DefaultListCellRenderer.UIResource {
        @Override public String getName() {
            return "List.cellRenderer";
        }

        @Override public void setBorder(Border b) {
            if (useUIBorder || b instanceof SynthBorder) {
                super.setBorder(b);
            }
        }

        @Override public Component getListCellRendererComponent(JList<?> list, Object value,
                  int index, boolean isSelected, boolean cellHasFocus) {
            if (!useListColors && (isSelected || cellHasFocus)) {
                SynthLookAndFeel.setSelectedUI((SynthLabelUI)SynthLookAndFeel.
                             getUIOfType(getUI(), SynthLabelUI.class),
                                   isSelected, cellHasFocus, list.isEnabled(), false);
            }
            else {
                SynthLookAndFeel.resetSelectedUI();
            }

            super.getListCellRendererComponent(list, value, index,
                                               isSelected, cellHasFocus);
            return this;
        }

        @Override public void paint(Graphics g) {
            super.paint(g);
            SynthLookAndFeel.resetSelectedUI();
        }
    }
}